Effect of smoking on coronavirus disease susceptibility: A case-control study.

Introduction: Tobacco use has changed since the onset of the coronavirus disease (COVID-19) pandemic. The effect of smoking on COVID-19 susceptibility has not yet been determined. In this study, we aimed to assess the association between smoking and COVID-19 susceptibility.

Preparation of Nano-Apatite Grafted Glass-Fiber-Reinforced Composites for Orthodontic Application: Mechanical and In Vitro Biofilm Analysis.

This study aimed to fabricate nano-hydroxyapatite (nHA) grafted/non-grafted E-glass-fiber-based (nHA/EG) and E-glass fiber (EG) orthodontic retainers and to compare their properties with commercially available retainers. Stainless-steel (SS) retainers and everStick Ortho (EST) were used as control groups. The retainers were evaluated with Raman spectroscopy and bonded to bovine teeth.

The Influence of Physical Activity on COVID-19 Prevention Among Quarantined Individuals: A Case-Control Study.

Background: Physical activity is a known preventive measure for many worldwide public health issues. The purpose of this study is to assess the association between physical activity and the susceptibility to COVID-19 infection.

Patients And Methods: This was a retrospective matched case-control study involving adult participants quarantined with IAU, Dammam, Saudi Arabia.

Effect of Steam Heat Sterilization on the Accuracy of 3D Printed Surgical Guides.

Introduction: Steam heat sterilization could be one of the factors that affects the dimensional accuracy of surgical guides, leading to an error during guided implant surgery.

Objective: The purpose of this study was to investigate the effect of steam heat sterilization on the dimensional changes of surgical guides.

Materials And Methods: A total of 27 surgical guides, which were made by either Formlabs printer (Formlabs Inc.